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From "Ashu Pachauri (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17892) Hierarchical paths for WALs
Date Sat, 08 Apr 2017 00:08:41 GMT
Ashu Pachauri created HBASE-17892:
-------------------------------------

             Summary: Hierarchical paths for WALs
                 Key: HBASE-17892
                 URL: https://issues.apache.org/jira/browse/HBASE-17892
             Project: HBase
          Issue Type: Improvement
          Components: Replication, wal
            Reporter: Ashu Pachauri


Currently all WALs are just dumped into a single directory irrespective of the ServerName
for the regionserver to which they belong.
This is a problem specifically for the WALs archive directory (HConstants.HREGION_OLDLOGDIR_NAME)
since it holds a large number of files which can easily make it go above the HDFS max items
in a directory limit for large clusters in scenarios like pausing replication. HDFS imposes
a hard limit of around 6 million files in a single directory due to Protobuf serialization
limitations.

We should put WALs for a particular servername in its own directory inside the WALs (archive)
directory.



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